~(13)C-NMR研究聚丁二烯的序列结构

本文采用~13C-NMR方法研究了不同催化体系制备的聚丁二烯。经分析指出,聚丁二烯分子链的三种序列(顺-1,4-序列、反-1,4-序列和1,2-序列)和十七类脂碳碳核为~13C-NNR谱贡献了十六个谱峰。经数据的解析,得到一组计算聚丁二烯脂碳部分各谱峰化学位移的经验参数。在本文条件下,应用该组参数得到的计算值与实验值符合较好。本文确认了聚丁二烯反-1,4-序列第四峰(T_4)的存在。初步研究了聚丁二烯~13℃-NMR谱图的定量处理问题。

13C-NMR STUDY OF SEQUENCE STRUCTURE OF PBD

Several polybutadiene samples prepared with different catalysts Were studied by 13C-NMR. It is shown by analyzing the molecular chain of polybutadiene that there are three sequences (cis 1,4-sequence, trans 1,4-sequence and 1,2-sequence) and seventeen aliphatic carbon nuclei in it. These nuclei contribute to the sixteen peaks on the ¹³C-NMR spectrum of polybutadiene. A group of empirical parameters is obtained by analyzing the chemical shift data of the peaks. When using them in our case, the calculated values of chemical shift of the peaks agree quite well with the experimental ones. A T₄peak,the fouth peak oftrans 1,4sequence,was first discovered by the present work.Quantitative treatment of the se-quence structure ofpolybutadiene was preliminaryly studied.